Patek Philippe Grand Complication Celestial Moon Age Watch - 6102P-00144 mm platinum case, 10. 58 mm thick, sapphire crystal back, Celestial dial with black sapphire crystal disks for sky background and moon phases, transparent sapphire crystal disk for sky chart and Milky Way, and blue sapphire crystal disks for sky background and moon phases, caliber 240 LU CL C self winding movement with date by hand, hours and minutes of mean solar time, sky chart, phases and orbit of the Moon, time of meridian passage of Sirius and